1.1 Scope
This method specifies the method for determining chromium content in copper and copper alloys.
This method is applicable to the determination of chromium content in copper and copper alloys. The determination range is: 0.00005%~0.0010%.
1.2 Principle
Dissolve the test sample with nitric acid and then inject the test solution of certain volume into the electrothermal atomizer; measure the chromium absorbance at the wavelength of 357.9nm with the Zeeman effect atomic absorption spectrometer, and then calculate the mass fraction of chromium in the adoption of the working curve method.
1.3 Reagents
Unless otherwise stated, only identified analytical reagent and distilled water, or deionized water or water with equivalent purity shall be used for analysis. Vessels used for test shall be thoroughly rinsed with water after being soaked in nitric acid (1.3.3) for 12h.
Foreword I
1 Method I Zeeman Effect Electrothermal Atomic Absorption Spectrometric Method 1
2 Method II Flame Atomic Absorption Spectrometry 4
3 Method III Titrimetric Method 7
Appendix A (Informative) Comparison between Chapter and Article Numbers of Method II in this Part and those of ISO 4744: 1984 11
Appendix B (Informative) Technical Differences between Method II in this Part and ISO 4744: 1984 and the Reasons 12
